Punch



F. HINDS Oct, 16, 1934.`

PUNCH Filed June 16, 1934 2 Sheets-Sheet Inveniar EWI'QJ?, #7,7145

A Homey F. HINDS Oct. 16, 1934.

PUNCH Filed June 16, 1934v z sheets-sheet 2 In venvr A Homey By QM ..5 of fibrous or other comparatively soft material Patented Oct. 16, 1934 UNITED STATES PATENT FFIC- v t .1.;97sl99zw y i j y PUNCH.;4 4- Y, ForrestiHind's, Monroe, Mich. t Substitute for abandoned application, Serial No. 512,736, January 31, 1931. This application Juneie, 1934;,soria1 No. 731,094 Y 1 olaim. (ol. 164-29) This invention relates generally to punches and more particularly to alnew and useful improvement in a.V .cutting punch which is especially adapted for use in connection with sheets or slabs but it is understood, of course, that a punch in accordance with this invention may be used for any purpose and in any manner for which the same may be found adapted and desirable.

This application is a substitute for abandoned application Serial No. 512,736, filed Jan. 31, 1931.

'I'he usual procedure in the cutting of a predetermined hole, slot or figure in a fibrous material such as paper, fibre board, natural or .i515 artificial wood, cork, asbestos or any other type of material capable of being cut by a knife by means of pressure, is to cut in such a manner as to return the slug and sheet at the same time, leaving the cutting device free of slugs. The slugs are retained by the sheet, thus necessitating a second operation to remove the retained slugs from the sheet after removal from the press.

One of the objects of this invention is to reduce or eliminate the expense of the second operation,

Y. "2..5 namely the removal of retained slugs from the sheet, thus eliminating a large proportion of labor cost in trimming said sheet.

Another object of this invention is to reduce the cost of die-cutting by elimination of a large proportion of broken punches caused by the clogging of slugs in the punch, which causes the cutting device to expand and consequently break after a short period of service.

A further object is to provide a means of cuttingV y retain its original position rmly and secure at all times and under all conditions.

Other objects of the invention are to provide, in a manner as hereinafter set forth, a punch of the aforementioned character whichV will be simple in construction, strong, durable, eflicient and reliable in operation and which may be manufactured at low cost.

All of the foregoing and still further objects and advantages of the invention may become ps5 apparent from a study of the following specilcation, taken in connectionv with the accompanying drawings wherein, like characters of reference designate corresponding parts throughout the Lseveral-viewsand whereinL-'f-Y i Figurel isa Aview in-vertical section through ,59 a punch in accordance with this invention.

Figure 2 is a view in bottom plan thereof.

Figure 3 is a view in vertical section taken substantially at right angles to Figure 1.

Figure 4 is a perspective View showing the punch Q5 constituting this invention detached from the die block. l

Figure 5 is a view in vertical section showing a slightly modified form of the invention.

Referring to the drawings in detail, it will be 7;9 seen that the reference numeral 1 designates the substantially cylindrical body portion or barrel of the punch having formed integrally on one end thereof a flange 2 which is countersunk in the supporting block 3 and secured therein by suitable elements such as screws 4 which pass through the countersunk openings 5 provided therefor in the ange 2. The body portion 1 is disposed in a bore 6 provided therefor in the block 3 and with one side of which bore a sub- .15,0 stantially triangular slug discharge recess or opening '7 in the block 3 communicates.

An annular or polygonal beveled cutting edge 8 is formed integrally with the other end of the body portion 1, the bevel of said cutting edge loe-1 8? ing on the outside. The punch further includes an angular or longitudinally curved bore 9 for the reception and passage of the slugs which extend from the cutting edge 8 to the side of the body portion 1 and communicates with the discharge V9,0 recess 7, as illustrated to advantage in Figure 1 of the drawings. 'I'he bore 9 is slightly tapered, the small end thereof being at the cutting edge 8. The curve or angle of the bore 9 successively deilects the slugs laterally from a straight lineg thereby breaking the same away from each other should said slugs tend to stick together and permitting them to fall by gravity through the opening 7. The flange 2 is essential to seat the punch securely in the die board or block 2 and to hold it Y m0 securely in place during use. This is essentially important where so much of the die board or block is cut away to allow the slugs to drop from the press through means of the recess or opening 7. r

Figure 5 of the drawings illustrates a slightly modified form of the invention which is particularly for use in cutting material which is such that the slugs tend to adhere to each other and thereby fail to readily drop by gravity from the punchrjm chamber 10 and disposed for engagement bythe` slugs which are designated by the reference nu,-` meral 14 in a manner to direct said slugs outwardly from the chamber 10 into the dischargel recess or passage l1 through which the slugs drop by gravity. 1f

The beveled cutting edge 8 in both vembodi-A ments of the invention may, of course, be triangular, hexagonal, octagonal, square, oblongor polygonal configuration instead of annular as exemplied in the drawings. It is believed that the many advantages `of a punch in accordance with this invention will be readily understood, and, although the preferred embodiments of the invention are-as illustrated and described, it is to be understood that changes in the details of construction may be had which will fall within the scope of the invention as claimed.

What is claimed isz- A device of the class-described comprising a supporting block havingra `chamber and -a bore therein communicating witheach other, the bore v`passing from the top face of the block through the lower face thereof, and the chamber passing through the lower face of the block, the top face of the block being countersunk around the bore, a 'cutting die including a iiange and a barrel part, vthe flange being secured in the countersunk and the barrel part passing through the bore and hav- '"ng'an'end projecting therefrom which is beveled 'to Lform' a cutting edge, said barrel part having its bore' curvingupwardly and outwardly through a zside `of the barrel Where the bore discharges into the chamber, said bore gradually increasing in diameter to its upper end, and the curved part of Vthe bore of the barrel acting to separate the slugs cut by the cutting edge of the barrel.

FORREST HINDs. 

